Wood-cutter or countersink.



P. M. GRANDPERHI'N. WOOD CUTTER 0R GOUNTERSINK. APPLICATION FILEDAPB..29, 1909.

Patented June 21, 1910.

INVENTOR.

PVITNESSES: w #1. Y

ANDREW SARAH/v.1 cm PNOTU-UTHOGHAPNERS WASNING'YON, ac

UNEE

PAUL IVI. GRANDPERBIN, OF SAG HARBOR, NEW YORK.

WOOD-CUTTER ORCOUNIERSINK.

To all whom it may concern:

Be it known that 1, PAUL M. GRANDPER- RIN, a citizen of France, residingat Sag Harbor, in the county of Suffolk and State of New York, haveinvented a new and useful VVood-Cutter or Countersink, of which thefollowing is a specification.

This invention relates to a wood cutter or counter sink intendedespecially for wood work, by means of whlch holes or apertures can bebored in wood.

It has long been admitted and recognized that wood workers were badly inneed of a cheap and effective wood cutter. My device provides a woodcutter, or counter sink, which has the advantages over most of theprevious inventions in the same line, that it can be manufactured andsold at an exceptionally low price and that it can be hardened and stillbe easily sharpened without taking the temper out of said cutter.

Being experienced in minute cabinet making, I often had to endure muchannoyance when wishing to do counter sinking in thin boards. It oftenresulted in spoiling the work, for it often occurs that the edges are sobadly torn that the work is much disfigured, and thin boards seldomoffer the resistance required for the use of many of the existingcutters or counter sinks. Therefore, my object was to overcome thesedifliculties, and I have succeeded in providing a wood cutter or countersink which will leave the apertures made by it as smooth as can bedesired, which will cut edges as sharp as can be expected from wood, andwhich will leave the bottom of the cutting very smooth and flat, ifdesired.

This wood cutter is most suitable for speedily working arrangements suchas lathes.

In the accompanying drawing forming a part of this specification Figure1 is a perspective view of the shank and cutter combined; Fig. 2 is aperspective view of the cutter detached; Fig. 3 is a plan view of theshank; Fig. 4 is a perspective view of the holding stem; Fig. 5 showsthe shank and holding stem in perspective and the cutter in sideelevation, the holding stem being partly drawn out of the shank and thecutter ready to be mounted Specification of Letters Patent.

Application filed April 29, 1909.

Patented June 21, 1910.

Serial No. 493,006.

said cutter; Fig. 7 is a top plan view of said cutter; Fig. 8 is abottom view of said outter; Fig. 9 is an end view, and Fig. 10 is theother end view of said cutter.

Like reference numerals indicate corre sponding parts in the differentfigures of the drawing.

The said wood cutter is made of suitable metal and size. The contourline of the bottom view has much the appearance of a parallelogrambisected, each part being beveled,-see 1 and 2 of Fig. 2, the bevelingsrunning in a reversed direction to each other and meeting in the middleof said cutter, giving the appearance of an oblique line running throughthe center and bisected by an aperture.

The cutter, or counter sink, is ground to a bevel on each side,see 8 and9; a bevel at each end,see 10 and 11, and two bevels on the bottom sideas shown. These bevelings are combined so that the intersections of thesides with the bottom and ends of said outter, form on the contour lineof the bottom of said cutter, sharp cutting edges, 1 and 2 which extendalong the said cutter from the ends beyond the middle thereof and areconnected by a diagonal line crossing the center and forming oppositelyfacing cutting shoulders decreasing in depth from the longitudinal edgestoward the center of the cutter. For working the said cutter, I providethe well known shank, which is at one end fiattened or cut away so as toform a projection 12, Fig. 3. Said shank is provided at one end in thecenter of the face with a suitable aperture 14: and is also providedwith a threaded aperture 13 to admit a suitable screw 15.

Projection 12 is shaped so as to correspond to a suitable groove 5 whichis provided in the middle of the top of said cutter.

To hold the said cutter in position when mounted on the stem, I havedevised a simple means which resides in employing a rather small stem,which I call a holding stem, see Fig. 4, the diameter of which isslightly augmented at one end.

The smaller end is admitted through a suitable aperture 1, in the centerof the cutter, and is then inserted in the aperture 14 of the shank asmuch as possible. Screw 15 on the shank; Fig. 6, also, is a side view ofl holds the stem and thus the said cutter in allel diagonal cuttingshoulders decreasing in depth from said longitudinal edges of the facetoward the center longitudinal line of the bit.

In testimony that I claim the foregoing as my own, I have a Xed mysignature in the presence of tWo Witnesses.

PAUL M. GRANDPERRIN. l/Vitnesses:

MARY RUNDY, GEO. S. BLOOMINGBURGH.

Working position, it being understood that the projecting end 16represents the largest in diameter portion of the holding stem.

I claim A cutter bar or bit adapted to be fitted transversely to a shaftand oppositely beveled on one face from opposite longitudinal edges ofsaid facefrom each end to a point beyond the center such oppositelybeveled portions meeting on a diagonal line intersecting the centerpresenting alined or par- 1

